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Students were asked to participate in a competition for making an decorative Pen holders in shape of a cylinder with a base using cardboard. Each pen holder wasof radius 3cm and height 10.5 cm. School has to supply cardboard for competition to competitors. If there r 35 competitors so how much cardboard school has to bring.

Posted by Pushkar Pawar 8 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Deepak Baghel 8 years, 2 months ago

Radius of base of cylinders =3cm Height of cylinders =10.5cm Curved surface area of penholder =2πrh =2×22/7×3× 10.5cm =44×3×1.5 =198[cm×cm] The cardboard required to make a pen holder =C. S. Area of pen holder+area of base of pen holder =198+πr×r =198+3.14×3×3 =198+28.26 =226.26(cm×cm)

2Thank You

Arohi Chaudhary 8 years, 2 months ago

CSA +base*35

2Thank You

Pushkar Pawar 8 years, 2 months ago

Plz ans. fast

0Thank You

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